A great solution to messy eating birds that spill unwanted seeds and food underneath their feeders - looking untidy and attracting rodents.The 20cm seed catching tray simply screws to the bottom of these high-quality aluminium feeders, catching debris and acting as a secondary feeding platform for the birds to feed from.The feeders themselves will hold 600g of seed mix and stand approx. 33cm high without the hanging hook - which adds an extra 8cm. Their width is 14cm with the perches, 6cm without.